Nothing to be embarrassed about a first diagnostic of 141 is not bad and in all honesty you are not going to be in the top 20% of ambitious college graduates that are motivated enough to actually show up to the LSAT, which is what a 160 LSAT score is.
Once you attend law school there is an 80% chance you will not be in the top 20% of the class either.
If you get a 154 you can get into plenty of ABA approved law schools, which is an accomplishment and you don't need to go to Harvard or Yale to be a lawyer. In fact 99% of practicing lawyers didn't go to Harvard or Yale.
So the best advice is be realistic with yourself and set realistic expectations otherwise it is going to the LSAT, law school, the bar exam and working as a lawyer is going to be a struggle.
With that said if your not putting your best effort in then put the test off until summer. If you are only a junior in college there is no rush you might consider taking the December LSAT or just taking the June test and seeing what happens. You can retake without any real consequence almost every school takes your top score at this point.
The advice you will need throughout the whole law school process is to not over think things. It seems like you are concerned that there is a chance you will not score a 160 and odds are you will not. That does not mean it is the end of the world you can get into nearly 100 ABA schools with a 154 and a good GPA.
Good luck to you and here is a good article about choosing a law school for when that time comes. http://www.legalmatch.com/choose-the-right-law-school.html